Answered by ZUPAN
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Jun. 30, 2019 03:12
Part one:
Sean, you didn't mention from where will you arrive in Guangzhou. OK, I will assume that this is some third country, different from both Hong Kong and mainland China. So, you itinerary is:
X country (different than both Hong Kong and mainland China) - Guangzhou - Hong Kong
This itinerary is eligible for 144 hours visa free transit and you don't need any kind of invitation letter. All you need is your valid passport, your flight ticket to Guangzhou and your pre-purchased train ticket from Guangzhou to Hong Kong. Regarding the train, be informed that you can only use Guangzhou–Kowloon through train departing from Guangzhou East railway station and arriving at Hung Hom railway station in Hong Kong. The train takes close to 2 hours for this journey. Now, one very important detail. You will have to purchase your ticket through some of the online agencies that will produce an e-confirmation of your purchase with your name/surname and the number of passports on it. Keep in mind that MTR website is not doing that, so purchasing through them could be in principle OK, but in the same time it could ruin your entire journey. Play safe and, as I have told you, purchase this ticket through one of several online agencies selling the ticket for this train online.